High cohesion waterborne pressure sensitive adhesives

Details High cohesion waterborne pressure sensitive adhesives High cohesion waterborne pressure sensitive adhesives

C - Chemistry, Metallurgy

09

J

C09J 153/00 (2006.01) C09J 151/00 (2006.01) C09J 151/06 (2006.01)

Patent

CA 2105837

ABSTRACT Waterborne pressure sensitive adhesive multipolymers exhibiting very high cohesive strength may be prepared by a two stage emulsion polymerization procedure (overpolymerization) in which the first stage is a low Tg (i.e., less than about -20°C) copolymer having good adhesive properties, and the second stage is a high Tg (i.e., greater than about +25°C) non-pressure sensitive homopolymer or copolymer and wherein the ratio of the first stage to the second stage are between 80 to 20 and 99 to 1.

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